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UEVENT Statement Details
 
Syntax
  UEVENT ON
  UEVENT OFF
  UEVENT STOP
 
The effects of the UEVENT statements are like that of other event-trapping
statements. When UEVENT ON is executed, the event-trapping routine is
enabled. Occurrences of the event trigger execution of the event-handling
routine.
 
When UEVENT OFF is executed, the event-trapping routine is disabled. Any
occurrences of the event are ignored.
 
When UEVENT STOP is executed, the event-trapping routine is suspended.
An event occurrence is remembered, and the event-trapping routine performed
as soon as a UEVENT ON statement is executed.